Stand up straight and make sure your toes and kneecaps are pointing straight ahead. Pick up one foot and balance on the other. Bend down about six inches and then return to the starting position. Make sure your toes and kneecaps continue to point straight; do not allow them to angle in or out. Do 10 knee dips with your right knee and 10 with your left knee.
Lay on your stomach on the ground. Place your left foot on top of your right heel. Try to pull your right foot up, but use your left foot as resistance. Hold this exercise for 10 seconds before your relax. Do 10 repetitions altogether, and then switch feet and put the right foot over your left heel and do the same exercise 10 more times.
Sit on a chair, keep your left foot on the ground and extend your right foot straight out. Tighten your right thigh muscle for a count of three. Relax the muscle and then repeat the exercise until you have done 10 reps. Do 10 reps with the left leg. By tightening your muscles, you will help build strength in the knee.